<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert show-icon title="注意：只允许为第三级分类" type="warning" :closable="false"></el-alert>
      <!-- 选择商品分类 -->
      <el-row style="margin: 15px 0;">
        <span>选择商品分类: </span>
        <!-- 级联选择框 -->
        <el-cascader v-model="selectdCateKeys" :options="cateList" :props="{ expandTrigger: 'hover', ...cateProps }" @change="handleChanged"></el-cascader>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, itemIndex) in scope.row.attr_vals" :key="itemIndex" closable
                 @close="handleClosedTag(itemIndex, scope.row)">{{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                  >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, itemIndex) in scope.row.attr_vals" :key="itemIndex" closable
                 @close="handleClosedTag(itemIndex, scope.row)">{{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                  >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%"
     @close="addDialogVisibleClosed">
      <!-- 添加参数的输入框 -->
      <el-form :model="addForm" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%"
     @close="editDialogVisibleClosed">
      <!-- 添加参数的输入框 -->
      <el-form :model="editForm" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectdCateKeys: [],
      activeName: 'many',
      onlyTableData: [],
      manyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      addForm: {},
      // 修改对话框的显示与隐藏
      editDialogVisible: false,
      editForm: {}
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('/categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.cateList = res.data
    },
    handleChanged() {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectdCateKeys.length !== 3) {
        this.selectdCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      // 根据所选的分类的id， 和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`/categories/${this.cateId}/attributes`, { params: { sel: this.activeName }})
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }

      // 对数组属性 进行拆分
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    addDialogVisibleClosed() {
      // 有问题 实施输入的会不显示，但是能添加
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
          { attr_name: this.addForm.attr_name, attr_sel: this.activeName })

        if (res.meta.status !== 201) {
          this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`,
        { params: { attr_sel: this.activeName }})

      if (res.meta.status !== 200) {
        this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogVisibleClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应的参数项
    async removeParams(id) {
      const confirmRustle = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除的操作
      if (confirmRustle !== 'confirm') {
        return this.$message.info('已取消删除操作!')
      }

      // 删除的逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }

      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点，或 按下回车键触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
      }

      // 如果没有return 那么就要做提交input值
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // $nextTick 方法的作用：当页面的上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ') }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    // 删除对应的参数可选项
    handleClosedTag(index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true, 否则返回false
    isBtnDisabled() {
      if (this.selectdCateKeys.length !== 3) {
        return true
      } else {
        return false
      }
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectdCateKeys.length === 3) {
        return this.selectdCateKeys[2]
      } else {
        return null
      }
    },
    // 动态计算 对话框 标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
.input-new-tag {
  width: 200px;
}
</style>
